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Three‐Step Spin State Transition and Hysteretic Proton Transfer in the Crystal of an Iron(II) Hydrazone Complex
Author(s) -
Nakanishi Takumi,
Hori Yuta,
Wu Shuqi,
Sato Hiroyasu,
Okazawa Atsushi,
Kojima Norimichi,
Horie Yusuke,
Okajima Hajime,
Sakamoto Akira,
Shiota Yoshihito,
Yoshizawa Kazunari,
Sato Osamu
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006763
Subject(s) - proton , bistability , chemistry , chemical physics , protonation , electron transfer , hydrazone , metastability , crystallography , dipole , spin transition , transition dipole moment , photochemistry , materials science , stereochemistry , organic chemistry , physics , ion , optoelectronics , quantum mechanics
A proton–electron coupling system, exhibiting unique bistability or multistability of the protonated state, is an attractive target for developing new switchable materials based on proton dynamics. Herein, we present an iron(II) hydrazone crystalline compound, which displays the stepwise transition and bistability of proton transfer at the crystal level. These phenomena are realized through the coupling with spin transition. Although the multi‐step transition with hysteresis has been observed in various systems, the corresponding behavior of proton transfer has not been reported in crystalline systems; thus, the described iron(II) complex is the first example. Furthermore, because proton transfer occurs only in one of the two ligands and π electrons redistribute in it, the dipole moment of the iron(II) complexes changes with the proton transfer, wherein the total dipole moment in the crystal was canceled out owing to the antiferroelectric‐like arrangement.